I had an SA GPX loop pop off a month ago, and decided to make another.
Joni and Frank Whiton have posted pics of loops they've made, and both
say they work well. I cut the end of the line at a 45 degree angle, and glued
it to the line, doubling the line over roughly the same amount as from the
factory. I used CA glue to get a quick bond, and seal the end. I then used
red 6/0 tying thread to bind the doubled over line together, and size the loop.
Joni reports success with Sally Hansen Hard as Nails to seal the thread, so I bought bottle for
$2. The resulting loop is almost as supple as a factory looped end, and it floats
great. I've used that line a lot since making the loop, and everything is
great so far.